Derwood, Maryland Weather
Cicadas claim the afternoon. Day 15 of summer. Read this microseason across nine climate regions →
Derwood weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast37%—99°78°—
- SundayJul 5Overcast41%—96°74°-3°
- MondayJul 6Showers75%—86°73°-10°
- TuesdayJul 7Showers75%0.05″78°69°-8°
- WednesdayJul 8Light Drizzle37%0.02″77°67°-1°
- ThursdayJul 9Overcast11%—93°67°+16°
- FridayJul 10Light Drizzle45%—96°72°+3°
AQI 82 (Moderate), driven by PM2.5. AQI up 6 over the last 6 hours (gradual rise). PM2.5 at 11.2 µg/m³, PM10 at 11.7 µg/m³ — typical background levels with no transport signature.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 50. Overcast through the UV peak window (cloud cover ~67%) — afternoon ozone should stay flat.
- Present
- AQI 50
- UV peak
- 0.1 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 6
PM × Wind × Precip
PM2.5 at 11.2 µg/m³, PM10 at 11.7 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.96
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- background
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 11:25 PM
- Moonset
- 11:18 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Derwood at a glance
- Today vs. normal: 10°F above the seasonal normal for this latitude
- Last frost: April 11 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 20855
16-Day Forecast — Derwood
- Sat99°78°37%
- Sun96°74°41%
- Mon86°73°75%
- Tue78°69°75%
- Wed77°67°37%
- Thu93°67°11%
- Fri96°72°45%
- Sat83°68°36%
- Sun80°65°23%
- Mon85°61°20%
- Tue91°64°17%
- Wed89°66°33%
- Thu88°64°37%
- Fri90°69°42%
- Sat90°71°44%
- Sun87°68°46%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 5, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
SPC Convective Outlook
Storm Prediction Center — Derwood
SPC has placed Derwood in the Enhanced Risk category for severe thunderstorms today.
- TODAYENHEnhanced Risk
- TOMORROWSLGTSlight Risk
- DAY 3TSTMGeneral Thunderstorms
Numerous severe storms likely. Tornadoes, large hail, and damaging wind gusts possible across the area. Track NWS warnings if storms develop.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
ZIP codes in Derwood
- 20855